S-91133A120 0.562" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through hot-dip galvanized steel coating, extending service life in demanding environments.
• Superior load distribution with a large 2" square surface area, preventing surface damage and fastener loosening under high stress.
• Precision fit for 1/2" screws with a 0.562" inner diameter, ensuring secure fastening and reducing assembly time.
• Exceptional mechanical strength backed by Rockwell B40 hardness, providing reliable performance in heavy-duty applications.
• Consistent dimensional stability with a controlled thickness range of 0.235" to 0.265", guaranteeing uniform clamping force.
• Compliance with global environmental regulations including RoHS 3 and REACH, ensuring safe and responsible sourcing for international projects.
• Durability in construction and industrial settings, designed to withstand vibration, weathering, and structural loads.

Professional Applications & Engineering Value

This galvanized steel square washer is engineered to address common industrial challenges such as joint failure and material degradation. Its square shape provides a larger bearing surface compared to standard round washers, effectively distributing clamp load and preventing pull-through in soft materials or under dynamic loads. The zinc coating offers a robust barrier against rust and corrosion, making it ideal for outdoor construction, infrastructure, and marine applications where exposure to moisture is a concern. Paired with a 1/2" screw size, it ensures a precise fit that minimizes play and maintains structural integrity in assemblies subject to vibration or thermal expansion. By specifying this washer, engineers and procurement specialists secure a component that enhances the longevity and reliability of bolted connections in frameworks, machinery, and heavy equipment.

Specification Summary & Compliance

This square washer conforms to standard inch system dimensions with an inner diameter of 0.562", width of 2", and thickness ranging from 0.235" to 0.265". It is manufactured from galvanized steel with a hardness of Rockwell B40 to meet industrial strength requirements. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) as of January 17, 2023, ensuring adherence to health and environmental safety standards.